Michael Eavis greets festival goers as he drives on to the site at Glastonbury 2010. Photograph: Felix Clay for the Guardian

Glastonbury festival founder Michael Eavis has said that "my personal preference is for people that come to our festival to drink much less!".

The 77-year old dairy farmer posted a message on the festival's official website on Thursday in an attempt to clarify rules about bringing alcohol on site.

Earlier in the day, ticket holders had received an email from organisers explaining that while "Glastonbury is the only major UK festival that allows you to take alcohol into the event", over-indulgence is discouraged.

Four rules must therefore be observed:

1. Any alcohol brought onto the site must be for personal consumption only2. No glass bottles can be brought onto the site3. You must be able to carry your alcohol yourself, without using any wheeled devices, including trolleys, wheelbarrows and wheeled suitcases.4. Any alcohol which is brought to the gates using a wheeled device will not be allowed in, and may be confiscated

Festivalgoers on forums expressed concern that any such ban on wheeled devices bearing booze would severely harm their enjoyment of the festival, with comments including "Going to piss off a fair few people if they try and enforce it at the gates. Cue mass drink up trying to get under the limit to get through".

"In reference to the email about alcohol that went out to Glastonbury 2013 ticket holders this morning, my personal preference is for people that come to our festival to drink much less!

However, Glastonbury remains the only major festival that allows people to bring their own alcohol in, and you are still OK to bring your own alcohol through the gates, providing it's just for your own use (whether it's on a trolley or not)."